[VM interpreter] Fix bad ifdef.

Change-Id: Ib2a211578dc7b83ca836aaa7e0748b008807d078
Reviewed-on: https://dart-review.googlesource.com/64766
Reviewed-by: Régis Crelier <regis@google.com>
diff --git a/runtime/vm/runtime_entry.cc b/runtime/vm/runtime_entry.cc
index 9226211..219cd3c 100644
--- a/runtime/vm/runtime_entry.cc
+++ b/runtime/vm/runtime_entry.cc
@@ -2583,11 +2583,7 @@
     reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&atan)));
 
 uword RuntimeEntry::InterpretCallEntry() {
-  uword entry = reinterpret_cast<uword>(RuntimeEntry::InterpretCall);
-#if defined(USING_SIMULATOR) && !defined(TARGET_ARCH_DBC)
-  UNIMPLEMENTED();
-#endif
-  return entry;
+  return reinterpret_cast<uword>(RuntimeEntry::InterpretCall);
 }
 
 // Interpret a function call. Should be called only for uncompiled functions.